package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.OrderDetail;
import com.sky.entity.Orders;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额统计接口
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        List<Double> turnoverList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.isAfter(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        for (LocalDate date : dateList) {
            // select sum(amount) from orders where status = 5 and order_time > ? and order_time < ?
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status",Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);

        }
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 用户统计接口
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO userStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        List<Integer> newUserList	 = new ArrayList<>();
        List<Integer> totalUserList	 = new ArrayList<>();
        dateList.add(begin);
        while(!begin.isAfter(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        for (LocalDate date : dateList) {
            // select count(id) from user where create_time <= end and create_time >= begin 新增用户
            // select count(id) from user where create_time <= end 总用户量
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("end",endTime);
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);
            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    /**
     * 订单统计接口
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO ordersStatistics(LocalDate begin, LocalDate end) {
        /**
         * 日期列表，以逗号分隔
         * 订单完成率 select count(id)/(select count(id) from orders) "CompletionRate" from orders where status = 5 group by status;
         * 订单数列表，以逗号分隔 select count(id) from orders where order_time >= begin and order_time <= end
         * 订单总数 select count(id) from orders;
         * 有效订单数 select count(id) from orders where status = 5;
         * 有效订单数列表，以逗号分隔 select count(id) from orders where status = 5 and order_time >= begin and order_time <= end
         */
        List<LocalDate> dateList = new ArrayList<>();
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();

        dateList.add(begin);
        while(!begin.isAfter(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }


        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map mapWithDate = new HashMap<>();
            mapWithDate.put("begin",beginTime);
            mapWithDate.put("end",endTime);
            Integer orderCount = orderMapper.countByMap(mapWithDate);
            mapWithDate.put("status",Orders.COMPLETED);
            Integer validOrderCount = orderMapper.countByMap(mapWithDate);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        Integer totalOrder = orderCountList.stream().reduce(Integer::sum).get();// (a,b)->Integer.sum(a,b)
        Integer validOrder = validOrderCountList.stream().reduce(Integer::sum).get();// (a,b)->Integer.sum(a,b)
        Double completionRate = validOrder.doubleValue()/totalOrder;

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .totalOrderCount(totalOrder)
                .validOrderCount(validOrder)
                .orderCompletionRate(completionRate)
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .build();
    }

    /**
     * top10接口
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO top10(LocalDate begin, LocalDate end) {
        /**
         * 商品名称列表，以逗号分隔 	销量列表，以逗号分隔
         * select name,count(id) as "number" from order_detail group by name order by number desc limit 10;
         */
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        Map map = new HashMap<>();
        map.put("begin",beginTime);
        map.put("end",endTime);
        map.put("status",Orders.COMPLETED);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.top10(map);
//        for (GoodsSalesDTO goodsSalesDTO : goodsSalesDTOList) {
//            nameList.add(goodsSalesDTO.getName());
//            numberList.add(goodsSalesDTO.getNumber());
//        }
        List<String> nameList = goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numberList = goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());


        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(nameList,","))
                .numberList(StringUtils.join(numberList,","))
                .build();
    }

    /**
     * 导出运营数据表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
